Why are you worried about an insignificant amount of fragmentation, and drive with 23 or less fragmentation is within operating norms. There's no such creature as "100% defragmentation" in the real world
I would also like to apprise that running Defragmentation under SAFE-Mode of Windows also tinkers with 'Recovery Drive' as well!
Though the % continues to depict as 0% fragmented, yet the respective Defragmentation continue to proceed ahead with a Real-time Updates over amount of time left!
Is 0% fragmentation a False positive? OR Defragmentation of Recovery-drive is the greater of the two Lies? :-)
I should have said "trying to achieve 100% defragmentation on your system drive is nigh on impossible."
defragging any other drive/partition down to 0% is actually pretty easy.
that's due to every other drive, apart from the system one, not being 'live':- there is no pagefile, updates, background tasks, AV software, restore points etc etc always active.
The way Win10 adds files back in immediately after running CCleaner it's of no surprise that there's always a level of unavoidable fragmentation and I'm not referring to locked in-use files, just the rubbish that Win10 relentlessly creates.